Short answer
Usually yes. The longer amortization can reduce the required payment, but CMHC applies a 20-basis-point insurance-premium surcharge to eligible 30-year insured mortgages, and slower principal repayment can increase total interest.
The concern behind the question
The client focuses on the lower monthly payment and assumes the 30-year option is simply a free affordability improvement. The missing comparison is the insurance premium, interest paid over time and balance remaining at renewal.
What the official rule says
CMHC announced a 20-basis-point premium surcharge for eligible borrowers choosing the increased 30-year amortization. Other insurers publish and apply their own approved premium schedules.
What the headline does not tell you
Twenty basis points means 0.20 percentage points of the insured loan amount, not 0.20% added to the mortgage interest rate. Actual premiums depend on loan-to-value and insurer rules. A lender may offer a different contract rate or product between scenarios.
A practical Ontario example
Illustration only: Two approvals have the same purchase price and down payment. The 30-year option lowers the qualifying and contractual payment, but it can start with a slightly larger insured balance and reduce principal more slowly. The better choice depends on cash flow and planned prepayments.
Practical options to review
Ask for side-by-side payment, premium, five-year balance and total-interest illustrations. If the lower payment is necessary to qualify, test whether the budget remains comfortable after taxes, condo fees and other ownership costs—not only whether the lender approves.
Before relying on the rule
- Confirm the announcement and effective dates against the official source.
- Identify whether the transaction is insured, conventional, a straight switch, a refinance or a tax claim.
- Separate verified facts from assumptions about income, property value, occupancy and available funds.
- Check the lender’s and insurer’s current policy; a government program does not guarantee mortgage approval.
- Compare the cash-flow benefit with premiums, interest, taxes, fees and the exit plan.
Rajiv’s broker perspective
A rule should answer only the question it was designed to answer. It may expand eligibility without solving appraisal, income, credit or closing-fund problems. I would first identify the client’s real concern, verify the dates and documents, and then compare the practical A, alternative/B, MIC or private routes only where they genuinely apply.
Unsure how this rule fits your purchase or renewal? Request a mortgage strategy second opinion with Rajiv.